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package com.jopek.pai_fillo_nai;
import android.os.Build;
import java.util.Arrays;
public class Bot {
static int meTheBot, opponent;
static int[] board;
static boolean isntBoardFull() {
for (int j : board)
if (j == -1)
return true;
return false;
}
static int goodOrBad() {
int[][] possibilities = new int[][]{
{0, 1, 2}, {3, 4, 5}, {6, 7, 8},
{0, 3, 6}, {1, 4, 7}, {2, 5, 8},
{0, 4, 8}, {2, 4, 6}
};
for (int[] poss : possibilities) {
if (chkTriEqOnGB(poss[0], poss[1], poss[2])) {
if (board[poss[0]] == meTheBot) return +10;
else return -10;
}
}
return 0;
}
static int minimax(int depth, Boolean isMax) {
int score = goodOrBad();
if (score == 10)
return score;
if (score == -10)
return score;
if (!isntBoardFull())
return 0;
int best;
if (isMax) {
best = -1000;
for (int i = 0; i < board.length; i++) {
if (board[i] == -1) {
board[i] = meTheBot;
best = Math.max(best, minimax(depth + 1, !isMax));
board[i] = -1;
}
}
} else {
best = 1000;
for (int i = 0; i < board.length; i++) {
if (board[i] == -1) {
board[i] = opponent;
best = Math.min(best, minimax(depth + 1, !isMax));
board[i] = -1;
}
}
}
return best;
}
static int getBestMove(int[] board, int bot, int opp) {
Bot.board = board;
Bot.meTheBot = bot;
Bot.opponent = opp;
int bestVal = -1000;
int bestMove = -1;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
if(Arrays.stream(board).filter(c -> c == -1).count() == 9) return 4;
}
for (int i = 0; i < board.length; i++) {
if (board[i] == -1) {
board[i] = meTheBot;
int moveVal = minimax(0, false);
board[i] = -1;
if (moveVal > bestVal) {
bestMove = i;
bestVal = moveVal;
}
}
}
return bestMove;
}
// CheckTripleEqualityOnGameBoard
public static boolean chkTriEqOnGB(int a, int b, int c) {
return board[a] == board[b] && board[b] == board[c] && board[a] != -1;
}
}
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